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AS3687 Datasheet(PDF) 12 Page - ams AG

Part # AS3687
Description  Flexible Lighting Management
PDF  55 Pages
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Manufacturer  AMSCO [ams AG]
Direct Link  http://www.ams.com
Logo AMSCO - ams AG

AS3687 Datasheet(HTML) 12 Page - ams AG

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AS3687/87XM
Datasheet
www.austriamicrosystems.com/AS3687
1v3-4
11 - 54
R2 = Feedback resistor R2.
R3 = Feedback resistor R3.
IDCDC_FB = Tuning current at pin 29 (DCDC_FB); 0 to 31µA.
Table
4 – Voltage Feedback Example Values
Ivtuning
Ustepup_out
Ustepup_out
µ A
R2 = 1M
Ω, R3 not used
R2 = 500k
Ω, R3 = 50kΩ
0
-
13.75
1
-
14.25
2
-
14.75
3
-
15.25
4
-
15.75
5
6.25
16.25
6
7.25
16.75
7
8.25
17.25
8
9.25
17.75
9
10.25
18.25
10
11.25
18.75
11
12.25
19.25
12
13.25
19.75
13
14.25
20.25
14
15.25
20.75
15
16.25
21.25
…
…
…
30
31.25
28.75
31
32.25
29.25
Caution:
The voltage on CURR1, CURR2 and CURR6 must not exceed 15V – see also section ‘High
Voltage Current Sinks’.
7.1.4 PCB Layout Hints
To ensure good EMC performance of the DCDC converter, keep its external power components C2, R2, L1, Q1,
D1 and C9 close together. Connect the ground of C2, Q1 and C9 locally together and connect this path with a
single via to the main ground plane. This ensures that local high-frequency currents will not flow to the battery.
7.1.5 Step up Registers
Reg. Control
Addr: 00
This register enables/disables the Charge Pump and the Step Up DC/DC Converter
Bit
Bit Name
Default
Access
Description
3
step_up_on
0
R/W
Enable the step up converter
0b = Disable the Step Up DC/DC Converter.
1b = Enable the Step Up DC/DC Converter.



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